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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6932a5df64200da1d227b171421cf19edae883128a3683cfb4621ec9ee80a17' 
  AND token = 'BVcRU2F7RUM4X10WOSYsDFclZxT8HxQ62Ys8HkaCctI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}